Controller governor



V. SCHLEYER CONTROLLER GOVERNOR Filed June 2, 1923 THEE/NE INVENTOR.War-0,? jC/MfYf/W,

ATTORNEY Patented @et. it,

"VICTOR SCHLEYER, h ANDERSON, INDIANA, ASSIGIQ'OR, MESNE ASSIGNMENTS, TO

DEAN HILL PUMP COMPANY, OF ANDERSON, INDIANA, it. CORPORATION OF IN-DIANA.

CUDTTEUIJIJER GOVERNOR.

ltt is the objectof my invention to provide a safety controller-governorfor pumps; by which controller-governor it may be possible fundamentallyto govern the speed of the it pump by varying the supply of steam to itsdriver in response to variations in the pressure produced by the pump asopposed by variations in the pressure of the steamsupply, to combinewith this balanced-action W governing a safety cut-off which shuts oil.the supply of steam if the pressure produced by the pump fails, toobtain this safety cut-oif by a simple valve-construction operated by agiven movement of the governing valve, and to provide a simple andeffective setting device for use in starting the pump whether initiallyor after a safety cut-off.

In carrying out my invention 1 have had particularly in mind a safetycontrollen governor for feed-water pumps for boilers, and the specificembodiment of my invent on is particularly adapted for that purpose; butmy invention is not limitedto pumps of that character, where it isessential that the pressure developed by the pump shall exceed theboiler pressure, but is adapted for the regulation and control of pumpsof various kinds, both reciprocating and rotary.

According to my invention, I provide a floating balanced-valveconstruction which controls thesupply of steam to the turbine or otherdriver which operates the pump. 1 connect this floating valve to twopistons, which I prefer to have at opposite ends of the structurecarrying the valve. One of these pistons is open to the steam-supply,and tends to move the valve in one direction. The other piston is actedon by the pressure of the water pumped by the pump, and tends to movethe valve in the other direction. This second piston is smaller ineffective cross-section than is the first when the device is used in.conncction with a feed-water pump, the ellective areas of the twopistons being inversely proportionalto the desired steam and waterpressures. When the water-pressiu'e fails, and its piston thus ceases toact on the valve, the steam'pressure acting on its piston throws thebalanced valve to one limit of its movement. According to my invention,a shut-off valve is associated with the balanced valve, and is arrangedto be closed to Shut o f the steam supply to the driver of the pump whenthis movement of the balanced valve to such limit of movement occurs.

The balanced valve and the shut-off valve are arranged to be setinnormal position by a manually controlled fluid-pressure device, to letsteam pass to the driver of the pump. The safety cut-oil feature serveseffectively to prevent the pump and its driver from running away, if theload on the pump is removed; and at the same time, this shut-off actiondoes not interfere with the normal governing movement by which thesupply of steam to the driver of the pump is controlled by the balancingof steam-pressure against water-pressure.

Some inventions shown in this application are described and claimedbroadly in my copending application Serial No. 642,398, filed May 81,1923. V

The accompanying drawing illustrates my invention: Fig. 1 is asemi-diagrammatic elevation of a turbine-driven centrifugal feedwaterpump equipped with asafety controller-governor embodying 'my invention,with the controller-governor in section; and Fig. 2 is a sectionaldetail of the resetting control valve. I

The'pump is shown as a centrifugal pump, driven by a turbine 11. Thepump 10 receives Water through an inlet'12 and discharges it through an.outlet 13; and when the pump is a feed-water pump, the inlet 12 isconnected to the feed-water heater, and the outlet 13 is connected tothe boiler, though my invention is not limited to pumps for that use.The steam for the pump-driving turbine 11 is supplied from. the'boilerthrough a. pipe 14, then through my safety controllergovernor 15, andthence by a. pipe 16 to the turbine.

My safety controller-governor has a main body-casing 20, in which abalanced valve 21 is movable perpendicularly to the general (ll? rectionof steam-flow through the controller governor. 'lhis body-casing has anextension 22 to which the pipe 14 is connected, and in this extension 22is the shut-0d valve 23, shown as of the butterfly type having anoperating arm 24 connected to an operating rod 25. The operating rod 25is connected at one end to piston-rod 26 eta piston 27 0P6??? ating in acylinder 28, which at one end has a vent'29 and at the other end isconnected to a pipe for supplying steam fluid under pressure to it, asfor example the steam pipe 14. In the pipe 30 is a re-setting controlvalve 31 (shown in detail in Fig. 2) which valve 31 when in there-setting position shown in Fig. 2 admits steam to the left-hand end ofthe cylinder 28 to move the. piston 27 to the right to open the shut-offvalve 23, and when in its other position, shown in Fig. 1,

' with its operating handle 32 turned 90 in steam-chamber 39 of thebalanced valve.

the counter-cloclnvise direction from the position shown in Fig. 2,shutsoif the supply of'steam through the pipe 30 andventsthe left-handend of tjhecyhnder 28. I

Thefbody-casing 20'also has an inwardly extending hollow I outlet-boss35, which is closed at its inner end and which at its outer endopensintothe pipe 16 leading to the turbine 11. This outlet-boss is'shown assubstantially opposite the inlet pipe 14 and shut off valve 23,and Iprefer that arrangement though it is not essential. A valve-stem 36extends transversely through the outlet-boss .35, and carries two valvedisks 37 and 38401 controlling the outflow 0t steam from the In theopposite walls of the hollow outlet-boss 85 are two'valve-rings 40 and41, with which the valve disks 37 and38 co-operate to control suchoutflow of steam. These valve disks 37 and 88 are shown as connected bywebs 42 for strength, and these webs serve the additional function ofassistingin guiding the valve in its movements. The spacing between thevalve-disks 37 and 38 is preferably the same as that between the twovalve-rings 40 and 41, as is common in balanced-valve constructions.

on one end of the valve-stem 36 is a steam- .pist-on 45, and on theother end a water-piston 46. These two pistons 45 and 46 are slidable incylinders 47 and 48 respectively. Onecnd 0f thesteam-cylinder 47 is opento the steamchamber. 39, so that the end of the piston 45 which istoward the valve-disk 37is exposed to the steam-pressure within suchsteamchamber. The steam-cylinder 47 on the other or outer side ofthepiston 45 is open to the atmosphere, through a draining vent-hole 49.The outer end of the water-cylinder 48 is also connected to theatmosphere, through a drain "hole 52. The innerend of such.water-cylinder 4 8 is connected by a pipe 53 to the-discharge pipe 13leading from the pump 10, sothat the piston 46 "is acted on by thewater-pressure developed by such pump. Between the adjacent ends of thewater-cylinder 48 and the steam-chamber 36 there is a stuifing box 55.

Beyond the water-piston 46, there is an extension 36 of the valve-stem36, which extension passes out through a stutfing box 56. The

outerendof'this valve-stem extension 36 carriesa cross p'in whichreceives the forked upper end61 of'a lever 62 mounted on a fixed esasespivot 63. The lower end of the lever 62 carrics a cross-pin 64 whichprojects through a slot 65 in the end of the operating rod 25, toprovide lost-motion.

he operation of the device is evident. lVith the pump at rest, theshut-off valve will be closed, as indicated in dotted lines, it: such"alve is also used as the main control valve. To start the pump, therc-sctting valve 31 will be turned to the position shown. to admit steamfrom the pipe 14 to the left-hand end of the cylinder 28. This steamacts to shift the piston 27 to the right, to an adjustable limitdetermined by an abutment screw 66 in the right-hand end of the cylinder28. This movement of the piston 27 opens the shut-off valve 23. It alsoacts through the lever 62 to shift the balanced valve 42 from itsfarthest position toward the right to an intermediate or floatingposition, and to hold it there while the pump 10 builds u its pressure.Upon the opening of the valve 23, the turbine 11 starts to operate, todrive the pump 10. As soon as the pump 10 builds up its water-pressure,such water-pressure is transmitted through the pipe 53 to thewater-cylinder 48, where such pressure acts on the piston 46 to tend tomove it toward the left, in opposition to the tendency of the steam onthe steampiston 45 to move it toward the right. As soon as thiswater-pressure is created, the valve 31 may be turned to its otherposition, to shut ofl? the steam from the cylinder 28. Then the balancedvalve 42 floats under the opposed steam-pressure and water-pressure,acting on the two pistons 45 and 46 respectively, and is moved as isnecessary to maintain a predetermined relation between two suchpressures, thus governing the pump automatically. The water-pressuredeveloped is higher than the steam-pressure, in feed-water pumps, sothat the water may be injected into the boiler against suchsteam-pressure, and the relation between these two pressures ismaintained reasonably constant by this automatic governing action. Toobtain this higher water-pressure, when it is necessary because thedevice is used for feeding boilers, the effective size of thewater-piston 46 is made smaller than the effective size of thesteampiston 45, so that the effective areas are in inverse proportion tothe desired pressures. If the water-pressure rises too high, its clientpredominates, and the water-piston 46 overcomes the steam-piston 45 andshifts the balanced valve 21 so that the valve-disks 37 and 38 arenearer the valve-rings 40 and 41, to cut down the supply of steam to theturbine 11 until the desired relation of steam-pressure andwater-pressure is re-established. If the water pressure falls too low,the steam-pressure predominates. and the steam-piston 45 overcomes thewater-piston 46, and shifts the valve to separate the valve-disks 37 and38 farther from the valve-rings 40 and 41to admit more steam to theturbine 11 Lmtil the desired relation of steam-pressure to waterpressure is re-established.

If anything happens to the water supply, either in the supply to thepump or in the discharge from the pump 10, so that the load on the pumpis suddenly relieved, the result is sometimes a racing of the pump andturbine, and the production of destructively high speeds. In case thewater-pressure developed by the pump 10 fails, myinvcnt-ion provides asafety device for preventing the pump and turbine from running away. Ifthe water-pressure in the pipe 13 fails, for any reason, thewaterpressurc against the piston 46 is immediately relieved. Inconsequence, there is no opposition to the action of the steam on thesteam-piston 45, and such steam-piston is shifted quickly as far as itwill go (to the right in Fig. 1), to an adjustable limit which is set byan abutment screw 67 in the end of the cylinder 47. This movement of thepiston carries the balanced valve 21 with it, and opens such valve Wide.However, upon this excessive shift ing of the piston 45 and balancedvalve 21 to the right, the resultant clockwise turning of the lever 62by reason of its connection with the valve-stem extension 36 more thantakes up the lost-motion in the slot 65, and

after taking up such lost-motion acts through the operating rod 25 toshift the latter and the piston 27 to the left and close the shutoffvalve 23. This shuts off the steam supply for the turbine, and preventsthe turbine and pump from destroying themselves.

After such shutting oif, the steam-supply may be reestablished, when theconditions are ready, by opening the valve 31, and resetting the valves21 and 23 in the manner already described.

For manual shutting down, it is of course possible to have a manualcontrol valve in the pipe 14; or 16. However, to get such shutting downmore easily, I prefer to provide in the pipe 5?; a valve 70,substantially like the valve 31. This valve is normally in position toadmit water therethrough from the outlet pipe 18 to the water-cylinder48. By turning this valve 70 to its other posi tion, it disconnects thecylinder 48 from the pipe 12?, and connects it to a drain or vent.'llhis maltes the water pressure on the waterpiston 46 fail, and causesthe steam-piston 4:5 to move to the right under the now-unopposedstea1n-pressure; which. causes the closing of the shut-off valve 23 inthe manner already described for the failure of the water-pressureacting on the water-piston I claim as my invention A Safety gQ slnr-contr ller for prestit sure producing pumps, comprising control meansfor controlling the supply of power to the driving means for a pump,means acted on oppositely by the pressure developed by the pump and bythe pressure of said powersupply to shift the position of said controlmeans to maintain a predetermined relation between said two pressures,and shut-oil means for shutting off the supply of power, said shut-offmeans being connected with said control means to be moved thereby toshutoil position by the movement of said control means which occurs whenthe pressure produced by the pump fails.

2. Ehe combination set forth in claim 1, with the addition of alost-motion device which is included in the connection between saidcontrol means and said shut-off means.

3. The combination set forth in claim 1, with the addition of apower-operated device for resetting said shut-off means.

t. A safety controller-governor for steam driven water pressureproducing pumps, comprising a valve for controlling the supply of steamto a steam-turbine driver for a pump, operating means for said valve,said operating means being acted on oppositely by the pressure of thesteam and by the wator-pressure developed by the pump, and separatevalve operably interconnected with said first valve and arranged to bemoved to closed position to shut off the steam-supply for said driverupon the movement of said first valve which is produced upon failure ofsaid water-pressure. v

5. The combination set forth in claim l, with the addition of alost-motion device which is included in the connection between said twovalves.

6. The combination set forth in claim 4, with the addition of apower-operated device for re-opening said second val e.

7. The combination set forth in claim 4:, with the addition of acylinder and piston associated with said second valve, and a manualcontrol valve for admitting steam to said cylinder and piston to causere-opening of said second valve.

8. The combination set forth in claim it, with the addition of manualmeans for shutting off the pump pressure from said means for shiftingsaid control means.

9. The combination set forth in claim 4t, with the addition of manualmeans for shutting off such water-pressure from said operating means.

in witness whereof, l have hereunto semy hand at Indianapolis, llndiana,this 29th day of May, A. D. one thousand nine hundred and twenty three.

' VICTOR SCHLEYER.

